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OpenStudy (anonymous):
Solve: 5(x + 7)2 = 25
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OpenStudy (anonymous):
is that squared?
OpenStudy (anonymous):
yes
jhonyy9 (jhonyy9):
5(x+7)*2 =25 / 5 --- (x+7)*2 =5 --- x*2 + 14x +49 =5 --- x*2 +14x +44 =0
jhonyy9 (jhonyy9):
14 +/- (196-88)*(1/2) 14 +/- (108)*(1/2) 14 +/- 2 radical 27 x_1,_2 = --------------------- = ------------------ = ------------------ 2 2 2 = 7 +/- radical27
jhonyy9 (jhonyy9):
= 7 +/- 3 radical 3
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OpenStudy (anonymous):
5x^2 +70x +245=25 5x^2+70x+220 x=-7 - sqrt 5 x=sqrt 5 -7
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